ZynAddSubFX is a powerful realtime, multi-timbral software synthesizer for Linux and Windows. It is microtonal, and the instruments made by it sounds like those from professional keyboards. The program has effects like Reverb, Echo, Chorus, Phaser...

Tool Command Language (Tcl) is an interpreted language and very portable interpreter for that language. Tcl is embeddable and extensible, and has been widely used since its creation in 1988 by John Ousterhout.
Bug reports to http://core.tcl.tk/tcl/
Follow code development at http://core.tcl.tk/tcl/

TkDND is an extension that adds native drag & drop capabilities to the Tk toolkit. It can be used with any Tk version equal or greater to 8.3.3 and currently only the UNIX (X-Windows), Microsoft Windows (XP, Vista, 7) and OS X (Leopard) operating systems.
Please note that sources have been moved to: https://code.google.com/p/tkdnd/

DRBL provides diskless or systemless environment. It uses distributed hardware resources and makes it possible for clients to fully access local hardware. It also includes Clonezilla, a partition and disk cloning utility similar to Ghost.

Matplotlib is a python library for making publication quality plots using a syntax familiar to MATLAB users. Matplotlib uses numpy for numerics. Output formats include PDF, Postscript, SVG, and PNG, as well as screen display.